various phases: more robust for keep-going

[nit.git] / src / ffi / extern_classes.nit

diff --git a/src/ffi/extern_classes.nit b/src/ffi/extern_classes.nit
index bc4f0c4..4e8f45d 100644 (file)
--- a/src/ffi/extern_classes.nit
+++ b/src/ffi/extern_classes.nit
@@ -68,10 +68,11 @@ private class ExternClassesTypingPhaseModel
                if not nclassdef isa AStdClassdef then return
 
                var mclassdef = nclassdef.mclassdef
-               var mclass = nclassdef.mclass
+               if mclassdef == null then return
+               var mclass = mclassdef.mclass
 
                # We only need to do this once per class
-               if mclass.intro != mclassdef then return
+               if not mclassdef.is_intro then return
 
                if mclass.kind != extern_kind then return